The Unit Design chooses facial features (eyes, face shape, skin color, etc) randomly, but allows you to customize unit weapons, armor, equipment, clothing, and hair… but not sex. Yes, you heard me: the Unit Design function does not enable you to choose the sex of your units. At least not by default. It turns out that only races who choose the Egalitarian bonus (at the cost of one point) are able to have both male and female units. The campaign faction is not egalitarian; in fact, only the Kingdom of Tarth is. So, breaking down the makeup of the default factions: only 1 out of 10 of the factions (10% of the total factions) allows for the creation of female units, while 90% (9 factions) force male unit creation, and 0% (0 factions) force female unit creation.